Close-corner drill.



F. A. IIM'ERSON.

CLOSE CORNER DRILL.

APPLlcAnoN man MAY-11,1917.

IN VEN TOR.

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CLOSE CORNER RILL. APPucATroN FILED MAY11,19|7.

1,255,31 6. Patented Feb. 5, 1918.

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IN V EN TOR.

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FRANCIS A. JIMEESONOE ATHENS, rENNsiLvANIA, AssrGN'oR 'ro iNGErtsoLE-nann COMPANY, OF JERSEYOITY, NEW JERSEY, A CORPORATION oE NEW JERsEY.

' CLOSE-CORNER DRILL.

i Specification of Letters Patent.

Patenten reas, taie.

Original application filed June 19, 1915, Serial No. 35,109. Divided and this application led. May 11, 1917.

Serial No.

To all whom t may concern:

Be it known that I, FRANCIS A. J1 MERsoN,

a citizen` of the United States, re'slding at Athens, in the county of .Bradford and State-of' Pennsylvania, have invented a certain new and useful Improvement in Close- Corner Drills, of 'which the following is a specification.

rlhis invention relates to fluld operated rotary drills, and more particularly to drills of this typcknown as close corner drills, which are designed to Operate 1n restricted spaces, and particularly relates' to improvements in the type of drill shown 1n the patent of Caid H. Peck, No. `1,172 Q01, granted .February 22d, 1916, this app 1cation being a division of my co-pending application Serial No. 35,109 filed June 19th, 1915.

These drills, as usually constructed, con- -sist of an elongated casing in the extremity of one end of which is located a rotary spindle which is generally operated by a series of ratchetlevers driven through the medium of small reciprocating motor elements set in the otherend of the casing.

. An object of the invention is to provide a construction having the motor pistons engaging and actuating the ratchet levers without the interposition of intermediate elements in which means are provided to definitely control the respective positions of the ratchet levers with regard to each other and at the same time limit and lcontrol their angular movement with respect to 4the drill spindle.l

A further object is to provide an arrangement for the ratchet levers and their driving motors whereby a pluralit of -inotors and ratchet levers having equal power can be arranged in a restricted space. i

further. appear, in view, a drill rhas been devised,1apractical embodiment of which is shown inthe accompanying drawings, yin

- which, i

partial View yof the casing,

Fi ure 1 is aside View, partly in section, on t e line'.1-1'ofFig. 2, and partly l. broken away to show the ratchet levers and 5o motr-inechani'sm in side elevation,

F1g.2 is a longitudinal horizontal section on the line -22 of Fig. 1, and Fig. 3 is a showing the .bear-- lng for .the crank shaft in section.

@particular piston,

The drill, as shown, comprises an elongated casing 1, at one extremity of which is a cylindrical spindle sleeve 2- the endsl of which project above and below thecasing 1. In this spindle sleeve 2 is rotatably supported the spindle 3, this spindle having an' upper bearing portion 4,a central toothed portion 5 and a lower bearing portion '6,

these being all of the same outer diameter.

The bearing portion v6 is journaled in a bushing in the lower part of the sleeve 2, while the bearing portion 4y is journaled in a bushing 7 which has an upper flange 8 resting on a shoulder in the sleeve 2. spindle 3 isprovided at its upper end with a flange 9 which rests on the upper faee`of The the bushing 8, thus preventing movement of the spindle in a downward direction, while movement of the spindle in an upward direction is prevented by a cap 10 threaded into the upper end of the sleeve l2, a ball set l1 being inserted .between the portion 5 of the spindle, the spindle forming a bearing or fulcrum for the oscillation of the levers. At the other end of are three cylinders 19, 2O` and 21, `whose axes are set at right angles to the length of the casing and at right anglesto the longi-` tudinal. axis of the spindle. in the, cylinders are pistons 22, 23 and 21, each of which consists of a piston element 25 and .a connecting rod element 26 which Reciprocating -is Ain theform of a pin rigidly secured in the inner side of the piston element and havingjallongitudinal slot 27 in its outer end into which end of the lever which is actuated by this this knob bein free to slide-1n the slot 27 toy allow for t e longitudinal movement due to the the levers.

projects a `lrnob28 on the' oscillation. of. t The three cylinders` 19., 20.15116;

the casing 21-are notlseton the same linel withV respect 'to the' spindlel lult the inner tyliundfnf2()- is set nearer the spindle andsomewhat beu tween theo other two so` that the cylinder overlaps to a certain extent onthe line of the spindle axis, ene-the end of the casing to be of considerably lessheight than it the cylinders were all on the same line. This arrangement of the 'cylinders also has the advantage that the spindle ends of the levers can be close together and yet the cylinder ends of the upper and lower levers need not be at any considerable angle from the spindle axis. Since by this arrangement of the cylinders the central lever 14 must be of less length than the upper and lower levers 13 and 15, and consequently the piston 23 `must have a shorter reciprocation in order to oscillate the lever 14 through the same angular distance as the levers 13 and 15, the cylinder 2O and the piston 23 are of larger diameter than the cylinders 19 and 21 and the pistons 22 and 24, so that the piston 23 shall exert the lsame force on the lever 14 as the pistons 22 and 24. To limit and equalize the angular movement of the levers 13, 14 and 15 a crank 29. is provided between the cylinders and the spindle. The casing 1 is split diagonall on the axis of this crank 29 semi-cylin rical bearing seats 30 being thus provided in each section of the casing for the ends of the crank 29 in which are placed ball bearing sets 31 surrounding the ends of the crank. The crank 29.has three offset portions 32, 33 and 34, one for each ratchet lever, set at angles of 120 from each other, these offset portions journaling in split bearing boxes 35 sliding longitudinally in slots 36 in the ratchet levers. This crank mechanism controls and equalizes the amount of angular movement of the levers causing each one to oscillate successively through the same angle of rotation with respect to the spindle. In the levers 13, 14 and 15 contiguous to the spindle 3 are set respectively paWls37, 38 and 39. These pawls 37, 38 and 39 are not set in their respective levers in the same position with respect to the longitudinal axes of their levers but are so set that each one of the series from top to bottomy will successively engage the same tooth of the spindle. This is accomplished by having the pawl in each lever from the top to the bottom successively advanced ovei' the preceding pawl with re.- spect to the longitudinal axes of the levers an angular amount equal to the angular space occupied by one spindle tooth divided b theI number of levers. tion et the pistons is accomplished by air admitted through an inlet passage` 40 and controlled by a rotary valve 41 which is operated through a pinion 42 on the upper endet the crank 29, an intermediate gear 43 and wa gear 44 mounted on the rotary valve 41.

The reciproca- VThe operation of the drill will be evident from the above description. The cylinders rious levers allows the regulation and con.- I

trol of the respective lpositions of the levers and limits and equalizes their angular movement, as well as furnishing positive mechanical control of the valve 41.

It is to .be understood that while the present showing and description -disclose only one specific embodiment of the present invention, other forms and modifications are included within the spirit and scope thereof, as expressed in the appended claims.

What I claim is:

1. In a close corner drill, a spindle, a plurality of cylinders mounted at right angles to the axis of said spindle, pistons in v said cylinders, ratchet levers engaging said spindle and directly connected to said pis-` tons and a crank mechanism for equalizing and limiting4 the oscillation of said levers.

2. In a close corner drill, a spindle, a series of cylinders mounted at right angles to the axis of, said spindle, one of said cylinders being at a less distance from the spindle than another and said cylinders having areas inversely, proportional to their distances from said Ispindle, pistons in said cylinders, driving levers for said spindle oscillated by said pinions and a crank mechanisml for equalizing the angular movement of said levers.

In a close corner drill, a spindle, a plurality of cylinders mounted et ri ht angles to the axis or' said spindle, one o said cyl-- inders bein at a less distance from the spindle than the others and one of said cylinders overlapping the others, pistons in said cylinders, driving levers for said spindle oscillated by said pistons and a crank mechanism for equalizing the angular movement of said levers. f

4. In a close corner drill,a spindle, three cylinders mounted at right angles to the axis ot' said spindle, one of said cylinders being at a less distance from the spindle than the others and said cylinders having areas inversely proportional to their distances from said spindle, one of said cylinders overlapping the others, pistons in said cylinders, driving leversfor said spindle oscillated by said pistonsI and a crank mechanism for equalizing the angular movement 'not' said levers.

FRANCIS A. J IMERSON. 

